Concrete edging and marking tool combined.



C. P. HOFF.

CONCRETE EDGING AND MARKING TOOL COMBINED.

APPLICATION FILED JULY 16-191].

Patented July 16, 1918.

BY J

CARL r. HOFF, or s'r. JOSEPH, MISSOURI.

CONCRETE EDG'INGAND MARKING TOOL COMBINED.

Specification of Letters Patent.

Patented. J uly. 16, 1918.

Application filed Jul 16, 1917. Serial No. 180,900.

To all whom it may concern:

zen of. the'Unit'ed States, residing at St.

Joseph, in the county of Buchanan and State of Missouri, have invented certain new and useful Improvements in Concrete Edging and Marking Tools Combined, of which the following is a specification, reference being had therein to the accompanying draw [y' invention relates to improvements'in concrete edging and marking tools, combined, the objects of which are, to provide a tool of this class, by the use of which concrete walks, pavement-s, and the like, can be evenly edged, either laterally, along both edges of a divider, at one time, or longitudinally, along a marginal confining rail; for loosening said divider and rail from the concrete, and for giving the edges of the concrete a smooth, neat form.

Further objects are, to provide adjusting means, whereby the cutting blades can be adjusted to various thicknesses of dividers, and also be so adjusted, as to be adapted to be used as a concrete marking tool. Still further objects are, to provide depth adj usting means, whereby the tool can be adjusted, to compensate for the shrinking in thickness, of the concrete, in such manner, that the edges of the concrete shall be smoothly troweled down, by passage of the tool thereover,

I attain these objects by the devices illustrated in the accompanying drawings, in which: a

Figure 1 is a longitudinal section, on the line X X, seen in Fig. 2, looking toward the right. Fig. 2 is a Verticalsection, on the line Y Y, seen in Fig. 3, looking toward the left. Fig. 3 is a horizontal section, on the line Z Z, seen in Fig. 1, looking downward. Fig. 4 is a front view of the tool, showing the parts in position for use as a longitudinal edger. Fig. 5-is a view, similar to Fig. 4, showing the parts in position for use as a concrete marker, with the gage plates removed. Fig. 6 is a view, similar to Fig. 4, showing the parts in position for use a concrete groover. Fig. 7 is a front view of one of the various other forms in which the blades ma be made. 7

Referring to Figs.'l, 2 and 3, the tool body 1 has uprights :2 formed therewith, between the upper ends of which, handle 3 is secured. Said body has slots 4, formed therethrough and has channel 5 formed longitudinally in the central portion of its bottom surface. Rider bar 6 is 'slidably mounted, for vertical movement in said channel. Said bar has the two threaded bolts 6, formed therewith, which latter are passed upward through apertures formed through body 1. Said bolts extend upward through nut apertures 2, which are formed inuprights 2. The upper end portions of said bolts extend into the widened apertures 2", which are formed in the upper end portions of said uprights. Apertures 2 are widened for permitting forward and backward movement of the upper end portions of bolts 6. Nuts 7 and lock nuts 7 are screwed on bolts 6", for adjusting the height of bar 6, and securely holding the same. Said lock nuts have holes 7 formed therein for reception of one end of a nail or other similar instrument, (not shown,) by which to turn and thereby tighten said lock nut.

Rider bar 6 may be adjusted to a level position, or be so adjusted, that its front end is lower than its rear end, for allowing'the described tool to be moved in a slightly inclined position, for purposes hereinafter described.

Said rider bar rides on the top surface of divider 8, (see Fig. 2,) which acts'as a straight'edge, for guiding said bar and the therewith connected'tool, both laterally and vertically. I V

Since the two bottom plates 9 are alike in construction and operation, but one is described.

Referring to Figs.@2 and 3, bottom plate 9 has the threaded studs 10 formed therewith. Said studs project upward through apertures formed through gage plates 11 and 11, and through their respective slots 4, through body 1. Each one of said studs has a thumb nut 12, screwed thereon, for adjustably securing said bottom plate and said gage plates at various distances from the center of the body 1.

The inner edge of bottom plate 9 is turned and projected downward, forming a" cutter 13, which is adapted to cut the concrete 14 from the sides of a divider 8; I

The longitudinal edges of said concrete, (of which but one edge shoavn,-)l are formed against border rails 15. The space between said b'order rails is divided by a plurality of dividers 8, of which but one is shown.

Concrete 14 is mixed and filled into the by moves the described tool toward the right;

, This o eration cuts sfaid' concrete loose from both sides of divider 8, and at the time, trowels' down the adjacent edge portions' of the concrete, to the form of bottom plates 9. it has been found in common practice, where but one at a time o'f the two edges of the concrete, is cut and troweled, that said edges are generally of uneven height. It will be understood, that by the use of the described tool, said edges are perfeetly formed and of even height, and that mu on time is saved in the operation.

Refe ring to Fig. a, one of the bottom plates" 9, with its cutter 13, and its gage plates 11 and ll are removed from body 1, after which the described tool is moved alon the longitudinal border rail 15, for cutting concrete 14 loose from said rail, and for troweling into shape, the adjacent edges of said concret j Referring to Fig; 5, gage plates 11 and 11' are removed, and the rider bar 6 is lowered by the reviously described bar adjusting mea-ns,-until said bar rests upon concrete 14, for adjusting the depth of cutters 13, in said concrete, after which the described tool is used as a concrete marker.

After placing and securing the parts in the position seen in Fig. 6, with cutters 13 against each" other, the tool is used as .a concrete groover. When this is done, outters 13 cut a groove in oncrete 14:, while the bottom surfaces of b0 te lates 9,- trowel the corners and the adjacent surfaces of said concrete into the forms of said bottom plates. In cases where concrete 1.4 is not much shrunken in thickness, the gage plates 11 and 11' are removed, and bar 6 is'adjusted as previously described.

While I have shown and described the cutters 13 in the foregoing manner, for use as a marker, as seen in Fig, 5, it is evident that said cutters could be made of various shapes, for making a variety of dififerently shaped marks in the concrete. One of such other forms of cutters is shown in Fig. 7 in which a plurality of cutters 17 are formed with the bottom plate 1.6. Said cutters, as will be seen, are for making shallower marks of a different form from the ones made by the previously described cutters.

Bottoin plate 16 is provided with the threaded studs 10 and the thumb nuts 12,

of which hut one" ofeach is shown. Saidtuds are adaptedtobe used inthe same ppsitionsasthe'previously described studs 101' Having fully described my invention, what I claim as new, and desire to secure by Let'- tersPatent, is:-' v j 1. In a concrete edging and marking tool; a" bod plate having slots formed therethrcu h; pair of hottoiii plates having? face of said body plate; and a handlese'cured between the upper ends of said uprights,

2. In a concrete edging and'inarki ng tool;

a bod late rovidfed with a handle therefor; a pair of bottorn plates; adjustable s'e-' curing means whereby said bottom plates are adjustably secured in the same plane on the bottom of said body plate with a space be tween them; and a concrete cutter formed with and projecting downward from each one of the adjacent edges of said bottom 3. In a concrete edging and marking tool; a body plate having a channel for med lon gitudinally in the center of the bottom thereof; a rider bar slid'ab'ly mounted for vertical movement in said channel; bar adjusting and securing means whereby each end of said bar is independently adjusted and se cured at various heights insaid channel; a pair of bottom plates; adjustable securing means whereby saidbottom plates are a'd justably secured in the same plane on the bottom of said body pl'ate; a concrete cutter of blade formation formed on each one of the adjacent edges of said bottom plates and extending downward therefrom; and ahaii dle whereby said body plate and the there'- with connected parts are moved over the sur face of concrete.

4:. In a concrete edging and marking tool;

5 plates;

a body plate provided with a handle therefor; a pair of bottom plates; a plurality of gage plates removably inserted between the bottom of said body plate and said bottom adjustable securing means whereby said pair of bottom plates and said gage plates are adjustably secured on the bottom of said body plate; and a concrete cutter formed on the adjacent edge of each One of said bottom plates said cutters extending 10 downward therefrom.

In testimony whereof I affix my signature in the presence of two witnesses.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I). 0. 

